Stop-motion device for sewing-machines.



PATE'NTED JAN. 29, 1907.

. E. B. ALLEN. STOP MOTION DEVICE FOR SEWING'MAGHINBSR APPLIOATION FILEDJAN. 29, 1906.

2 SHEETSSHEET 1.

filli PATENTED JAN. 29, 190?.

E. B. ALLEN. STOP MOTION DEVICE FOR SEWING MACHINES.

APPLICATION FILED JAN. 29. .1906.

2 SHEETS-BREE! 2.

java/Lia .stitch-forming mechanism -unlrrnn snares gnTENT OFFICE.

EDWARD B. ALLEN, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGERMANUFACTURING COMPANY,

A CORPORATION OF NEW JERSEY.

STOP-MOTION fiEVICE FOR SIWING-MACHINES.

' Patented Jan. 29, 1907.

Application filed January 29, 1906. Serial No- 298,435.

To mil Lilli/07771 it may concern:

Be it known that I, EDWARD B. ALLEN, a citizen of the United States,residing at Elizabeth, in the county of Union and State of New Jersey,have invented or discovered certain new and useful Improvements inStop-Motion Devices for Sewing-Machines, of which the following is aspecification, ref erence being had therein. to the accompanyingdrawings.

This invention relates to that class of stopmotion devices forsewing-machines by means of which such. machines may be automaticallystopped after groups of a desired number of stitches have been made, asin stitching buttonholes, sewing on, buttons, forming bars 1- tacks, andin other similar sewing operations requiring the formation of groups ofa predetermined number of stitches, the invention having for its objectto provide a stop-motion device or mechanism of the class referred towhich will include a :frictiolnpad so arranged and operated that themachine may be brought almost to a full stop by said pad before apositive stopping device comes into operation to finally arrest themovement of the driving-shaft of the machine, thereby reducing the shockor jar incidental to the final stopping operation. to a minimum.

In the accompanying drawings, Figures. 1

' and 2 are opposite side elevations of a buttonhoie-stitching machineembodying the present invention. Figs. 3 and 4 are rear end elevationsof the machine, Fig. 4 being partly in section, so as to show some partswhich are hidden in l ig. 3. Fig. 5 is a bottom view of the machineshown in the other figures.

Referring to the drawings, 12 denotes the work-plate, 13 the arm of themachine, and 14 the main shaft ournalcd in the upper part of said armand provided at its rear end with the fast and loose pull 15 16. The ofthe machine is of an old and well-kl'iowi i character and comprises theneedle 1'" bar 13, having a crank and pitman connec tion (not shown)with the forward end of the main shaft 14, so as to reciprocatevertically in a horizontally-swingii1g frame or gate 19, said needlecooperating in the usual manner -with'an oscillating shuttle working inthe shuttle-race and operated from a crank 21 at the lower end of thevertical shaft 22, geared I, carried by the nccdlcchine to be connectedwith swinging needle-bar frame or gate 19 for the I purpose of makingoverseaming or overedge stitches and also includes a buttonhole-cuttingmechanism and. a work-clamp; but as these and some-other features ofthis machine are not herein claimed, but are included in the jointapplication of myself and William E. Goodyear, filed January 8, 1906,Serial No. 295,077, ohly so much of the present maas will be necessaryto an understanding of the stop-motion mechanism thereof need be hereindescribed.

.The feed-wheel which is connected with the work-clamp so as to impartproper feeding movements thereto, is intermittingly rotated byclutch-dogs 47, gripping the flange of said wheel in a well knownmanner, and operated bya rocking hub.48, having arm 49,:connected by alink with the slotted arm 51 of a bell-crank lever, the other arm 52 ofwhich is forked to embrace an eccentric 53 on the vertical shaft- 22.

Adjacent to the fast and loose pulleys 15 and belt-shifter 134, carriedby the stop-motion lever or stopping-lever 135, pivoted to swing in andout on a rocking .block 136, held in a hub 137 on a bracket 138,attachcrl to the arm 13 of the machine. Within the lever 135 is avertically-movable plunger 139, yieldingly pressed upward by a settingand holding lever 141, the short upper arm of which is arranged to"engage the stop ping-lcvcr-135 to force the latter inward, as shown inFig. 2, when the rod 142, attached to the longer arm of said lever andwhich is a suitable treadlc, is depressed. Beneath the bcd-plalc of themachine is a two-armed tripping-lever 1.43 144, the arm 143 of which isprovided with a toepiccc to be engaged bythe tripping lug or projection12() on the intermittmgly-rotati ng food-wheel 40 when the machine is tobe slop'pC-d, the other arm 144 of said lever being held by the stressof the spring 145 in a notch 146 in the treadle-rod 142 to hold' theparts in the running position of the machine against the stress of thespring 147, serving to force the stopping-lever outward when the said uring 140. 'Plvotcd in suitable cars m thcbrac 'et 1381s a 16 on the main'or driving shaft 14 is a lever 143 144 is tripped by the lug orprojection 120, and the arm 144 of said lever is the inner face of thefast pulley near the periphery of said face, said pad being forced [0toward said pulley by a. spring 150, the stress .of which may be variedby the adjusting-pin 151 tapped in a lug 152 on the arm 13 and having anut or collar against which said spring abuts. Fast on the main shaft 14is a stopping cam or tap et 153, to be engaged y the plunger 137 W tenthe machine is to be stopped, and pressing against the stoppingl-le-verto soften the impact of the blow of t e stopping-tappet against the saidpluner or to absorb a part of the shock of such low is a s ring-pressedcushioning-pin 154. The brake ever 148- is rovided with an arm 155,extending behind t 1e stopping-lever 1 35, so that when said lever isforced inward to the position shown in Figs. 1 and 2 and the parts arein the running )osition of the machine the said lever wil hold thefrictionpad 149 away from the face of the fast puley; but when thestopping-lever is moved outward to stop )ing position said pad will bepressed by the spring 150 against said pulley to arrest its movement. Asthe stopping-lever will be tripped in stopping the machine nearly a fullrevolution of the main shaft before the tappct 153 strikes the plunger137, the speed of rotation of the shaft 14 will be so slackencd orreduced by the friction-pad 149 by the time the final stop is to, occurthat the jar or impact .will be softened to any desired degree,depending on the adjustment of said spring, and such adjustment of saidspring may be made that the final blow or shock in stopping will behardly perceptible.

The stop-motion device may be tripped manually by a latcrallyanovablepush-button 163, conncctcd by a link 1'64 \Yilll the.

arm 144 of the holding and tripping lever.

Having thus described my invention, 1 claim and desire to secure byLetters Patent- 1. .ln a stop-action device, the combination with arotary shaft having fast and loose prllcys thereon, of a hclt-shiftcr,-holding m ans for retaining said bclt-shiftcr in position so that thedriving-belt will 1'; n on said.

fast pulley, anion atic 1 cans for tripping the said holding :1 cans andfor moving said beltshifter, to transfer the driving-belt from said fastpnllcy to said loose ]).1llt a positive stopping device for said shaft,and a fricl ionpad which is operated illtlt)(1l(ltllil of the saidpositive stopping device and which is. released when the saidbelt-shifter is iovcd to transfer the said driving-belt to said loosepulley, the said friction-pad being ar ranged that when tlnas releasedit xvii! bi forced against said fast pulley to arrest or retard therotation thereof before the said positive. stopping device comes intooperation, so as to soften the jar or shock of the final stop.

2. In a stop-notion device, the co.'nbina-' tion with arota'ry shafthaving fast and loose pulleys thereon, of a belt-shifter, holding nteansfor retaining said belt-shifter in such position that the driving-beltwill run on said fast. pulley, automatic means for tripping said holdingmeans and for nzoving said beltshifter, to transfer the driving-beltfrom said fast pulley to said loose pulley, a positive stopping devicefor said shaft comprising-a stoppingdever, a friction-pad which isoperated independently of the said stopping-lever and which is. releasedwhen the said belt-' shifter is moved to transfer said driving-belt tosaid loose pulley, a spring which serves to force said friction-padagainst said fast ptlley, and adjusting means for varyingthe stress ofsaid spring to cause more or less arresting or retarding action to beexerted by said friction-pad before the said positive stopping deviceconxes into operation; where-- by the jar or shock of the final stop maybe softened to any desired degree.

3. A stop-motion device comprising a driven shaft, a positive stoppingdevice therefor, an independently-mountcd and independently-operatedarresting or retarding device for said shaft, and (Oalil Ull means fortripping said arresting or retarding and positive stopping devices intoaction to effect their successive operation upon the driven shaft.

4. A stop-motion device comprising a .drivenshaft, a positive stoppingdevice therefor, an indepcndentlymaounted and independently-operatedarresting or retarding device for said shaft, commonmeans for trip-.ping said arresting or retarding and positive stopping devices intoaction to effect their successive operation upon the driven shaft, and acushioning device for the said positive stopping device.

A stop-notion device comprising the combination with a driven shaft anda wheel or pulley fixed thereto, of a positive stopping device for saidshaft c-oirprising a stoppinglevcr, an arresting or-retarding deviceseparate from and operated, for its retarding function, imlqicndrntlv ofsaid stopping-lever and consisting of a spring-pressed pad arrangcd topress against said wheel or pnlhvv. andcoon on n cans for bringing saidarr:- ing or retarding and positive stopping devices into action toeffect their snccessivc operation ..pon the said driven shaft.

0. A stop-n otion device comprising the conibination with a driven shaftand a wheel or pulley fixed thereto, of a positive stopping rate fromandoperated, for its retarding upon the said driven shaft, andcushioning :0 means for the said stopping-lever.

In testimony whereof I aflix my signature in presence of twowitnesses.

EDWARD ALLEN.

device for said shaft comprising a stopping lever, an arrestingor',retarding device sepa- Witnesses:

HENRY A. KORNEMANN,

' H NRY J. MILLER.

